Cosmogenic 10Be results from the Outer Hebrides, NW Scotland

Please cite:

Stone J.O. and Ballantyne C.K. (2005) Dimensions and deglacial chronology of the Outer Hebrides Ice Cap, NW Scotland Journal of Quaternary Science 21, 75-84 (2006), in reference to these data.

Sample OS Grid ref Latitude Longitude Altitude Scaling 1 Scaling 1 Thickness Horizon Be-10 prod'n rate 2 [Be-10] 3 Exposure age 4 Internal error 5
(deg N) (deg W) (m asl) (spallation) (muons) correction correction (atom/g/yr) (10^5 atom/g) (kyr) (kyr)
High-altitude samples from above mapped trimlines
NH-1 NB 155073 57.968 6.812 790 2.151 1.477 0.976 1.000 10.55 ± 0.63 9.43 ± 0.28 91.2 ± 6.2 2.7
NH-2 NB 155073 57.968 6.812 790 2.151 1.477 0.961 1.000 10.40 ± 0.62 3.64 ± 0.09 35.3 ± 2.3 0.8
NH-3 NB 083100 57.987 6.937 662 1.922 1.393 0.970 1.000 9.38 ± 0.56 1.32 ± 0.04 14.2 ± 0.9 0.4
BM 1 NF 806315 57.262 7.298 605 1.829 1.361 0.970 1.000 8.93 ± 0.53 7.73 ± 0.18 88.3 ± 5.7 2.1
H-1 NF 825345 57.290 7.272 605 1.829 1.361 0.965 1.000 8.89 ± 0.53 5.75 ± 0.13 65.7 ± 4.2 1.5
Intermediate-altitude samples from below mapped trimlines
NH-4 NB 082088 57.976 6.937 425 1.550 1.246 0.961 1.000 7.51 ± 0.45 1.06 ± 0.02 14.1 ± 0.9 0.3
NH-5 NB 150056 57.952 6.819 370 1.472 1.214 0.979 0.999 7.26 ± 0.43 1.39 ± 0.06 19.3 ± 1.5 0.9
NH-6 NB 150056 57.952 6.819 370 1.472 1.214 0.965 0.999 7.16 ± 0.42 1.38 ± 0.03 19.3 ± 1.2 0.5
BM 2 NF 814322 57.270 7.287 310 1.392 1.183 0.978 0.996 6.84 ± 0.41 0.99 ± 0.03 14.5 ± 0.9 0.4
Low-altitude samples from ice-moulded whalebacks
015-NH NG 134926 57.832 6.828 118 1.149 1.076 0.978 0.995 5.65 ± 0.34 0.87 ± 0.02 15.4 ± 1.0 0.4
016-NH NG 135928 57.833 6.827 122 1.154 1.078 0.974 1.000 5.68 ± 0.34 1.28 ± 0.03 22.6 ± 1.4 0.5
017-NH NG 192991 57.893 6.740 135 1.169 1.084 0.972 1.000 5.74 ± 0.34 1.00 ± 0.02 17.6 ± 1.1 0.4
019-NH NG 193892 57.805 6.727 152 1.190 1.094 0.929 1.000 5.59 ± 0.33 1.16 ± 0.03 20.9 ± 1.3 0.5
023-NH NG 147969 57.870 6.812 70 1.093 1.050 0.957 0.994 5.26 ± 0.31 0.85 ± 0.02 16.2 ± 1.0 0.4

1 Correction factor relative to 1013.25 mbar and latitude greater than 60 degrees, based on the scaling factors of Lal (1991), as described by Stone (2000).
2 Assumed 10Be production rates: spallation: 4.95 ± 0.30 atom/g SiO2/yr, negative muon capture: 0.11 ± 0.02 atom/g SiO2/yr, at 1013.25 mbar and latitude greater than 60 degrees (Stone, 2000; Heisinger et al., 2002).
3 Measured relative to LLNL working 10Be/9Be standards, traceable to ICN 10Be standard.  Uncertainties propagated at ±1 sigma level including all known sources of analytical error.
4 Calculated simple exposure ages, assuming no prior exposure and no erosion during 10Be accumulation. Uncertainties are ±1 sigma (68% confidence) including including all known measurement uncertainties and an assumed uncertainty of ±6% in the 10Be production rate. These uncertainties should be used when comparing exposure ages to ages obtained with other methods.
5 Internal errors based on analytical uncertainties alone. These error limits should be used when comparing the exposure ages to one another.